Magnetooptical recording medium including five magnetic layers f

Details Magnetooptical recording medium including five magnetic layers f Magnetooptical recording medium including five magnetic layers f

1991-09-11

1993-03-02

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

365122, 360 59, 360114, 478694, G11B 1304, G11B 1114, G11B 724

Patent

active

051915618

ABSTRACT:
This invention relates to a magnetooptical recording medium that is capable of direct overwriting by light intensity modulation without using a separate source for generating an external magnetic field and that has four magnetic layers superposed on a substrate, wherein said magnetic layers has vertical magnetic anisotropy and any two adjacent layers being bound by exchange force. The medium is characterized in that a fifth magnetic layer not bound by exchange force is provided over the fourth magnetic layer or that a layer made of a rare earth element/transition metal alloy in which the magnetization of rare earth elements is dominant is provided between the first and second magnetic layers which are bound together by exchange force.

REFERENCES:
patent: 4878132 (1989-10-01), Aratani et al.
patent: 4955007 (1990-09-01), Aratani et al.
Saito et al., "Direct Overwrite by Light Power Modulation on Magneto-Optical Multi-Layered Media", Proc. Int. Symp. on Optical Memory, 1987, Japanese Journal of Applied Physics, vol. 26 (1987), Supplement 26-4, pp. 155-159.

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